Enterprise ASP NET 3.5 web application, architectural diagram, system design, layered structure, presentation layer, business logic layer, data access layer, database, SQL Server, IIS, Windows Server, server room, network infrastructure, routers, switches, cables, technical blueprint, UML diagrams, flowcharts, component interactions, dependency relationships, software development lifecycle, agile methodology, iterative approach, waterfall model, coding standards, best practices, C# code snippets, Visual Studio 2008, .NET Framework 3.5, ASP NET web forms, master pages, user controls, CSS stylesheets, JavaScript files, HTML markup, error handling mechanisms, security considerations, authentication modules, authorization frameworks, encryption algorithms, firewall configurations, load balancing strategies, scalability planning, high availability architecture, disaster recovery plans, technical documentation, system administration, deployment scripts, monitoring tools, performance optimization, caching mechanisms.